JP2936734B2 - Powder dispersion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder dispersing apparatus,
More specifically, the present invention relates to a powder dispersing apparatus that can be used in, for example, a powder analyzer for analyzing the particle size of a powder and is suitable for dispersing the powder so that the particles are independent of each other.

[0002]

2. Description of the Related Art In a powder analyzer of this type, a large number of powders are separated from each other in a dispersed state without coagulating or agglomerating a large amount of powder. Although it is necessary to supply the powder to the body particle size measuring unit, conventionally, in most cases, the powder contained in the hopper is received and dispersed by a single-stage powder disperser and supplied to a target location.

However, in the case of the above-mentioned conventional powder dispersing apparatus, since it has a single-stage structure, the dispersing force for the powder is not sufficient, and therefore, a part of the powder solidifies and the dispersion state becomes poor. There is a problem that the measurement of the particle size of the powder is adversely affected.

Accordingly, an object of the present invention is to provide a powder dispersing apparatus capable of improving the configuration of the apparatus and obtaining a good dispersion state of the powder.

[0005]

According to the present invention, there is provided a first fluid ejecting nozzle for ejecting a fluid, the first fluid ejecting nozzle being disposed in front of the first fluid ejecting nozzle, and having the first fluid ejecting nozzle. A first flow passage having a flow cross section that gradually reduces and then expands from the ejection nozzle side, wherein powder is blown into the first fluid passage by the first fluid ejection nozzle, and powder is supplied from the first fluid passage. A first powder dispersing means for ejecting a body, a second fluid ejecting nozzle for ejecting a fluid in a direction intersecting a direction of ejecting the fluid ejected from the first fluid ejecting nozzle, and a second fluid ejecting nozzle And a second flow passage having a flow cross-section that is gradually reduced and then expanded from the second fluid ejection nozzle side, and that the powder ejected from the first flow passage is supplied to the second fluid ejection nozzle. In the second flow passage Can included a powder dispersing apparatus characterized by comprising a second powder dispersing means for ejecting the powder from the second flow passage.

[0006] In the present invention, the second powder dispersing means may determine a direction of fluid ejection from the first fluid ejection nozzle and a direction of the second fluid ejection with respect to the first powder dispersing means. It is preferable that the fluid is ejected from the nozzle so that the fluid ejection direction is perpendicular to the nozzle.

[0007]

In the above-described powder dispersing apparatus, the powder from the powder supply source is first supplied to the first dispersing means. The supplied powder is constrained and conveyed to the first flow passage by the fluid ejected from the first fluid ejection nozzle. The powder together with the fluid is conveyed to a portion of the first flow passage where the flow cross section is reduced. As a result, the fluid carrying the powder is in a compressed state in this reduced portion. The powder-containing fluid that has passed through the reduced portion of the cross section of the first flow passage is in a divergent state because the cross section of the first flow passage is enlarged, and is transmitted to the second powder dispersion means. Inflow. At this time, since the fluid is in a divergent state, the individual particles are in an independent state.

The flow of the powder-containing fluid flowing into the second powder dispersing means at a high speed can be rapidly changed by the fluid ejected from the second fluid ejection nozzle. At this time, the powder which has been partially aggregated is forcibly brought into a separated state also by the first powder dispersing means.

The powder-containing fluid which has flowed into the second powder dispersing means at a high speed is blown off toward the second flow passage at a high speed by the second fluid ejection nozzle.

[0010] In the second powder dispersing means, the powder together with the fluid is conveyed to the portion where the flow cross section in the second flow passage is reduced. As a result, the fluid carrying the powder is in a compressed state in this reduced portion. The powder-containing fluid that has passed through the reduced portion of the cross section of the second flow passage is ejected in a divergent state because the cross section of the second flow passage is enlarged. At this time, since the fluid is in a divergent state, the individual particles are in an independent state.

As described above, since the powder is dispersed by the two powder dispersing means, the dispersion state of the powder which was incomplete by one powder dispersing means is completely changed, that is, the powder particles are dispersed. Are independent of each other and are not in a state of aggregation or coagulation.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail.

The powder dispersing apparatus 1 shown in FIG. 1 stores a required amount of powder and receives a powder from a hopper 2 as a powder supply source for discharging powder downward from a discharge cylinder 2a provided at a lower end portion. A first dispersing means 3 for receiving the powder and compressing and then diverging the fluid, and a fluid containing the powder dispersed by the first dispersing means 3 and receiving the powder-containing fluid again. Second dispersing means 4 for diverging after contraction
Are provided in a rectangular parallelepiped casing 5.

The casing 5 is provided with a horizontal hole 6 extending from the left end to the vicinity of the right end in FIG. 1 and a vertical hole 7 penetrating from the upper right end to the lower right end in FIG.

The first dispersing means 3 includes a first nozzle 8 as a first fluid ejection nozzle mounted on the horizontal hole 6 on the left end side of the casing 5 in FIG.
A first connecting member 9 for connecting a first air pipe 10 to the first nozzle 8, a nozzle end 8a of the first nozzle 8;
And a first compression / dispersion member 11 disposed from the vicinity of the vertical hole 7 to the vertical hole 7.

The first compression / dispersion member 11 has a Venturi tube whose diameter gradually decreases from the nozzle opening end 8a side to a substantially middle position and gradually increases from the substantially middle position to the end on the vertical hole 7 side. It has a first through hole 12 utilizing the principle. The first through hole 12 is a first flow passage in the present invention.

The discharge cylinder 2a of the hopper 2 faces above the nozzle opening end 8a of the first nozzle 8.

The second dispersing means 4 includes a second nozzle 13 serving as a second fluid ejection nozzle mounted on the vertical hole 7 at the upper right end of the casing 5 in FIG.
A second connector 14 for connecting the second air pipe 15 to the second nozzle 13, and a second connector 14 for connecting the second nozzle 13 to the lower end of the casing 5 from below the nozzle end 13 a of the second nozzle 13. The second compression dispersing member 1 attached to the vertical hole 7
6 is provided.

The second compression / dispersion member 16 uses the principle of a Venturi tube in which the diameter gradually decreases from the nozzle end 13a side to a substantially middle position, and gradually increases from the substantially middle position to the lower end of the casing 5. The second through hole 17 is provided. This second through hole 17 is a second flow passage in the present invention.

Below the vertical hole 7 of the casing 5,
The discharge auxiliary cylinder 18 provided with a hole 18a having an inner diameter equal to the diameter of the lower end of the second through hole 17 and the powder are sent to a target location, for example, a particle size measuring unit in a powder particle size measuring device (not shown). A third connector 19 for connecting the supply pipe 20 to the discharge auxiliary cylinder 18 is arranged.

A predetermined pressure of air is supplied from an air compressor (not shown) to the first air pipe 10 of the first dispersing means 3. 15 is supplied with air at a predetermined pressure from an air compressor (not shown). That is, the directions of action of air in the first and second dispersing means 3 and 4 are orthogonal to each other. In addition,
The direction of action of the air is set not only in the orthogonal direction but also in the arrangement of the first and second dispersing means 3 and 4 so as to form an arbitrary angle such as 80 degrees, 75 degrees, and 60 degrees. You may.

In FIG. 1, reference numeral 21 denotes packing.

Next, the operation of the powder dispersing apparatus 1 having the above configuration will be described with reference to FIG.

When a required amount of powder is put into the hopper 2 and air of a predetermined pressure is supplied from an air compressor (not shown) to the first air pipe 10 and the second air pipe 15, the hopper 2 The powder that falls downward from the discharge cylinder 2a first reaches the first through hole 12 of the first compression / dispersion member 11 by air ejected from the nozzle opening end 8a of the first nozzle 8, where the Venturi tube According to the principle described above, the jetted air is once compressed while containing the powder. In this compressed state, the individual particles collide with each other and repel upon collision. After that, it is dispersed and reaches the vicinity of the nozzle end 13a of the second nozzle 13.

The nozzle end 13 of the second nozzle 13
Under the shearing force of the air ejected from a, it bends at a right angle and reaches the second through hole 17 of the second compression dispersion member 16.
Here, the powder is compressed again according to the principle of the Venturi tube, and the individual separated particles are attached to each other, and then dispersed again to measure the particle size of the powder (not shown) through the hole 18a of the discharge auxiliary cylinder 18 and the supply pipe 20. It is supplied to a particle size measuring section in the apparatus.

As described above, according to the apparatus 1 of the present embodiment, the powder is discharged toward the target portion in a good dispersion state while avoiding agglomeration of the powder by performing the compression dispersion process twice. Becomes possible.

The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the invention.

[0028]

According to the present invention described in detail above, by adopting the above-described structure, the powder is subjected to the compression dispersion treatment twice to prevent the powder from agglomerating and to obtain a good dispersion state. Thus, it is possible to provide a powder dispersing apparatus capable of discharging powder toward a target portion.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of the embodiment device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Powder dispersing device 2 Hopper 3 1st dispersing means 4 2nd dispersing means 5 Casing 8 1st nozzle 11 1st compression dispersion member 13 2nd nozzle 16 2nd compression dispersion member

Claims (2)

(57) [Claims] 1. A first fluid ejection nozzle for ejecting a fluid, and a first fluid ejection nozzle having a flow cross section that is disposed in front of the first fluid ejection nozzle and that gradually reduces and then expands from the first fluid ejection nozzle side. And a first flow path, wherein the first fluid ejection nozzle blows powder into the first fluid path,
First powder dispersing means for ejecting powder from the first fluid passage, and a second fluid ejection nozzle for ejecting fluid in a direction intersecting the ejection direction of the fluid ejected from the first fluid ejection nozzle; A second flow passage disposed in front of the second fluid ejection nozzle and having a flow cross-section that gradually reduces and then expands from the side of the second fluid ejection nozzle, and ejects from the first flow passage. A second powder dispersing means for injecting the powder to be blown into the second flow passage by the second ejection nozzle and ejecting the powder from the second flow passage. Dispersion equipment. 2. The apparatus according to claim 2, wherein the second powder dispersing means ejects the first powder dispersing means with a fluid ejecting direction from the first fluid ejecting nozzle and a fluid ejecting direction from the second fluid ejecting nozzle. 2. The powder dispersing apparatus according to claim 1, wherein the powder dispersing device is arranged so that the direction of the ejected fluid is perpendicular.